From patchwork Tue Dec 4 08:21:31 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Roberto Sassu X-Patchwork-Id: 10711259 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 11E621057 for ; Tue, 4 Dec 2018 08:24:27 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 0795D2AC25 for ; Tue, 4 Dec 2018 08:24:27 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id F07C12ABF6; Tue, 4 Dec 2018 08:24:26 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.9 required=2.0 tests=BAYES_00,RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 7AA732AC25 for ; Tue, 4 Dec 2018 08:24:26 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1725994AbeLDIYZ (ORCPT ); Tue, 4 Dec 2018 03:24:25 -0500 Received: from lhrrgout.huawei.com ([185.176.76.210]:32790 "EHLO huawei.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1725983AbeLDIYZ (ORCPT ); Tue, 4 Dec 2018 03:24:25 -0500 Received: from lhreml701-cah.china.huawei.com (unknown [172.18.7.108]) by Forcepoint Email with ESMTP id 60AFA3859BA3; Tue, 4 Dec 2018 08:24:21 +0000 (GMT) Received: from roberto-HP-EliteDesk-800-G2-DM-65W.huawei.com (10.204.65.153) by smtpsuk.huawei.com (10.201.108.42) with Microsoft SMTP Server (TLS) id 14.3.408.0; Tue, 4 Dec 2018 08:24:16 +0000 From: Roberto Sassu To: , , , CC: , , , , Roberto Sassu Subject: [PATCH v6 0/7] tpm: retrieve digest size of unknown algorithms from TPM Date: Tue, 4 Dec 2018 09:21:31 +0100 Message-ID: <20181204082138.24600-1-roberto.sassu@huawei.com> X-Mailer: git-send-email 2.17.1 MIME-Version: 1.0 X-Originating-IP: [10.204.65.153] X-CFilter-Loop: Reflected Sender: owner-linux-security-module@vger.kernel.org Precedence: bulk List-ID: X-Virus-Scanned: ClamAV using ClamSMTP Update This version of the patch set includes an additional patch (7/7) which modifies the definition of tpm_pcr_extend() and tpm2_pcr_extend(). The new patch has been included to facilitate the review of the changes to support TPM 2.0 crypto agility for reading/extending PCRs. Original patch set description The TPM driver currently relies on the crypto subsystem to determine the digest size of supported TPM algorithms. In the future, TPM vendors might implement new algorithms in their chips, and those algorithms might not be supported by the crypto subsystem. Usually, vendors provide patches for the new hardware, and likely the crypto subsystem will be updated before the new algorithm is introduced. However, old kernels might be updated later, after patches are included in the mainline kernel. This would leave the opportunity for attackers to misuse PCRs, as PCR banks with an unknown algorithm are not extended. This patch set provides a long term solution for this issue. If a TPM algorithm is not known by the crypto subsystem, the TPM driver retrieves the digest size from the TPM with a PCR read. All the PCR banks are extended, even if the algorithm is not yet supported by the crypto subsystem. PCR bank information (TPM algorithm ID, digest size, crypto subsystem ID) is stored in the tpm_chip structure and available for users of the TPM driver. Changelog v5: - rename digest_struct variable to digest - add _head suffix to tcg_efi_specid_event and tcg_pcr_event2 - rename digest_size member of tpm_bank_list to extend_size - change type of alg_id member of tpm_bank list from u8 to u16 - add missing semi-colon in pcrlock() v4: - rename active_banks to allocated_banks - replace kmalloc_array() with kcalloc() - increment nr_allocated_banks if at least one PCR in the bank is selected - pass multiple digests to tpm_pcr_extend() v3: - remove end marker change - replace active_banks static array with pointer to dynamic array - remove TPM2_ACTIVE_PCR_BANKS v2: - change the end marker of the active_banks array - check digest size from output of PCR read command - remove count parameter from tpm_pcr_read() and tpm2_pcr_read() v1: - modify definition of tpm_pcr_read() - move hash algorithms and definition of tpm2_digest to include/linux/tpm.h Roberto Sassu (7): tpm: dynamically allocate the allocated_banks array tpm: add _head suffix to tcg_efi_specid_event and tcg_pcr_event2 tpm: rename and export tpm2_digest and tpm2_algorithms tpm: modify tpm_pcr_read() definition to pass a TPM hash algorithm tpm: retrieve digest size of unknown algorithms with PCR read tpm: ensure that the output of PCR read contains the correct digest size tpm: pass an array of tpm_bank_list structures to tpm_pcr_extend() drivers/char/tpm/eventlog/tpm2.c | 12 +-- drivers/char/tpm/tpm-chip.c | 1 + drivers/char/tpm/tpm-interface.c | 36 +++---- drivers/char/tpm/tpm.h | 23 ++--- drivers/char/tpm/tpm1-cmd.c | 26 ++++- drivers/char/tpm/tpm2-cmd.c | 154 +++++++++++++++++++++------- include/linux/tpm.h | 43 +++++++- include/linux/tpm_eventlog.h | 19 +--- security/integrity/ima/ima_crypto.c | 10 +- security/integrity/ima/ima_queue.c | 5 +- security/keys/trusted.c | 5 +- 11 files changed, 220 insertions(+), 114 deletions(-)